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US4432061A
Expired / Lapsed
US
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System for controlling the voltage of an electrofilter
Assignee: GEA Group AG
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Filing: 1981-05-06
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Granted: 1984-02-14
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Expires: 2001-05-06
Abstract
Abstract A system for controlling the voltage of an electrofilter of the type which, after a voltage breakdown, substantially reduces the magnitude of the electrofilter voltage. After a predetermined deionization time, the filter voltage is raised to a new level which is lower than the filter voltage at which the initial voltage breakdown occurred, by a predetermined amount. The filter voltage is subsequently raised in accordance with a predetermined voltage-time function until a further voltage breakdown occurs. The electrofilter voltage is controlled by a microcomputer system in accordance with stored control parameter values. The stored control parameter values are advantageously recalled to control the electrofilter voltage in response to the operating state of a plant in which the electrofilter is employed. In plants wherein a plurality of electrofilters are employed, each such electrofilter is controlled by an associated microcomputer system, the plural microcomputer systems being controlled by a central pilot computer. The central pilot computer of the plant computes strategies which enhance the energy efficiency of the overall electrofilter purification system.
Inventors
- 👤 Helmut Herklotz
- 👤 Gunter Mehler
- 👤 Franz Neulinger
- 👤 Helmut Schummer
- 👤 Horst Daar
- 👤 Walter Schmidt
- 👤 Heinrich Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:10
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A method for controlling the voltage of an electrofilter in a plant, the method having the steps of lowering the filter voltage by a predetermined amount after a voltage breakdown at the electrofilter, and raising the filter voltage in accordance with a predetermined voltage-time function until a further voltage breakdown occurs, the method comprising the further steps of: storing data corresponding to a plurality of voltage drop factors and a plurality of voltage-time functions prior to performing the step of raising the filter voltage; and controlling the operation of the filter in accordance with said data corresponding to said voltage drop factors and voltage-time functions, said controlling of the filter being performed in response to a selectable one of a plurality of process states of the plant.
Claim 2
Independent Claim
127 words
A method for controlling the voltage of an electrofilter in a plant, the method having the steps of lowering the filter voltage by a predetermined amount after a voltage breakdown at the electrofilter, and raising the filter voltage in accordance with a predetermined voltage-time function until a further voltage breakdown occurs, the method comprising the further steps of: storing data corresponding to a plurality of voltage drop factors and a plurality of voltage-time functions prior to performing the step of raising the filter voltage; and controlling the operation of the filter in accordance with said data corresponding to said voltage drop factors and voltage-time functions, said controlling of the filter being performed in response to a selectable one of a plurality of process states of the plant.
Claim 3
Dependent Claim
56 words
The method of claim 1 wherein there is provided the step of further storing data corresponding to nominal filter currents, and permissible undervoltages, said data corresponding to said voltage drop factors, voltage-time functions, nominal filter currents, and permissible undervoltages being stored at a point in time corresponding to the initiation of the operation of the filter.
Claim 4
Dependent Claim
120 words
A digital arrangement for controlling the voltage of an electrofilter employed in a plant, the arrangement being of the type wherein an electrofilter voltage is lowered by a predetermined amount after a voltage breakdown and thereafter raised in accordance with a predetermined voltage-time function until a subsequent breakdown occurs, the arrangement comprising: memory means for storing data corresponding to at least a plurality of voltage drop factors and a plurality of voltage-time functions, said data being stored at a point in time corresponding to the initiation of the operation of the electrofilter; and control means responsive to a selectable one of a plurality of process states in the plant for recalling corresponding portions of said data from said memory means.
Claim 5
Dependent Claim
120 words
A digital arrangement for controlling the voltage of an electrofilter employed in a plant, the arrangement being of the type wherein an electrofilter voltage is lowered by a predetermined amount after a voltage breakdown and thereafter raised in accordance with a predetermined voltage-time function until a subsequent breakdown occurs, the arrangement comprising: memory means for storing data corresponding to at least a plurality of voltage drop factors and a plurality of voltage-time functions, said data being stored at a point in time corresponding to the initiation of the operation of the electrofilter; and control means responsive to a selectable one of a plurality of process states in the plant for recalling corresponding portions of said data from said memory means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |